Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K16/00—Machines with more than one rotor or stator
  • H02K16/04—Machines with one rotor and two stators
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K16/00—Machines with more than one rotor or stator
  • H02K16/02—Machines with one stator and two or more rotors
  • H02K16/025—Machines with one stator and two or more rotors with rotors and moving stators connected in a cascade

Definitions

• the present invention relates to electric motors.
• US patent no. 4,532,447 also discloses a torque converter or a speed variator.
• This converter consists of an outer fixed armature (stator), an inter ⁇ mediate rotor and a rotor arranged centrally therein.
• the intermediate rotor is equipped with two sets of windings, the outer winding interacting with the outer, fixed armature and the inner winding influencing the inner rotor.
• the converter operates as a torque variator by connecting the inner rotor to a drive unit (e.g. a car engine) and connecting the intermediate rotor to a gearbox.
• a drive unit e.g. a car engine
• the intermediate rotor to a gearbox.
• Control of rpm and torque is effected in a very complicated manner, by controlling continuously that opposite poles are in correct mutual position during operation.
• British patent application, publication no. GB-A-2,271 ,025 discloses an electric motor having characteristics somewhat related to the characteristics of the present invention.
• the prior art motor is constructed from two stators (armatures) fixedly mounted in a motor housing, with an annular rotor arranged between the two fixed stators.
• the rotor consists of several small permanent magnets or magnetizable units (i.e. coils) fastened to the main shaft by means of arms or "spokes".
• Every coil or magnet is rotatable about its respective axis and absorbs a torque which is created when a voltage is supplied to the outer stator, so that the shaft does not rotate.
• the rotation of each rotating unit will be braked and cause the shaft to start rotating.
• the prior art motor utilizes variations of frequency or voltage to the two armatures in order to control the speed.
• the rotor is fixedly mounted in the shaft, and is composed from several detached small rotors rotating between the armatures and being peripherally (radially) placed in relation to the shaft.
• a voltage can be supplied to the small rotors via slip rings or similar.
• German Offenlegungsschrift DE 4341128 discloses a cylindrically shaped motor having a free-running rotor, so that the motor is a "double motor" where the output shaft rpm may appear as a difference between the rpm's of two part motors.
• the motor is restricted to a cylindrical embodiment, and is obviously not intended manufactured for utilization in an rpm range around zero. At the outset this prior art motor is designed for high output shaft speeds.
• fig. 1 shows a motor in accordance with the invention, in the form of a disc ⁇ shaped AC motor, in longitudinal section
• fig. 2 shows in a corresponding manner a disc-shaped AC motor constructed in accordance with the invention
• fig. 3 shows a disc-shaped motor with an axially extended rotor part
• fig. 4 shows in diagrammatic form the relation between the different rpm's for the two part motors
• fig. 5 shows an embodiment of the motor in accordance with the invention in closer detail.
• Disc-shape here refers to the fact that the fixedly mounted armature 1,the rotating pole wheel (or rotor) 2 and the rotatable armature 3 have the shape of discs situated side by side and have a common axis 4, which is the axis about which the rotor 2 and the rotatable armature 3 rotate.
• the armature 1 is fixedly mounted to the motor housing 9, and the windings or coils of this armature receive an AC voltage from a frequency converter 10 via a connection box 8.
• another per se independent part of the frequency converter 10 supplies in a corresponding manner an AC voltage to the windings/coils on the rotatable armature 3 via brushes and slip rings 7.
• the rotatable armature 3 has in its center a shaft 5 which is the motor output shaft, and the shaft 5 runs on ball or roller bearings 6 attached to the motor housing 9.
• the rotatable pole wheel 2 is in principle equipped with permanent magnets for interaction with the fixedly mounted armature 1 on one side, and on the other side the rotatable armature 3.
• the motor comprises in principle "two part motors", the rotor 2 being a rotor both in the part motor system consti ⁇ tuted by armature 1 /rotor 2, and in the part motor system constituted by armature 3/rotor 2.
• the part motor armature 1 /rotor 2 is in the following referred to as M1
• the part motor armature 3/rotor 2 is referred to as M2.
• the permanent magnets of the free-running rotor may, as is usual within this technical field, equally well be replaced by coils, however magnetizing current must then be supplied to the rotor via brushes/slip rings.
• the permanent magnets or the coils on rotor 2 form pole pairs on each respective side of the rotor.
• the rotor or pole wheel 2 which thus is situated between armatures 1 and 3, functioning as a rotor for both these armatures at the same time, rotates on a roller or a ball bearing attached to a central and inward protruding part of the motor housing 9, but it may also be supported by and rotate on a roller or ball bearing about the shaft 5.
• the operation of the DC motor in fig. 2 also takes place by analogy with what is described regarding the AC motor, but instead of changing the output frequency of a frequency converter, the output voltages from the voltage regulator 13 are changed in order to change the rotation speeds ⁇ 1 and ⁇ 2 for M1 and M2 respectively (quite similar designations being used as in the AC motor case).
• fig. 3 is shown a variant of the disc motor concept mentioned above both in the form of a DC and AC motor.
• the motor appearing in fig. 3 is as a starting point similar to the previously shown embodiments, but in particular the rotor 2 is different.
• the rotor is in this case shown as a substantially three-part construction, having one section between the two armatures 1 and 3 and one section outside each respective armature, while the three rotor sections are interconnected by cylindrical parts situated radially outside the two armatures.
• each of the three rotor sections has magnets with pole-pairs adapted for interaction with the armature windings, on those sides of the rotor sections that face the armatures, higher power can be obtained without having to increase the motor diameter.
• Electric connection details are not shown in fig. 3, however these can be designed in a corresponding manner as shown above, for DC and AC motor operation respectively.
• Fig. 4 shows in a diagram the relations between the rpm values.
• the shaft rpm equals the difference between rpm's n1 and n2.
• the sum of the rpm's n1 and n2 is defined as the relative rpm of the motor, and will be constant when the rpm's are regulated in parallel.
• Cooling of the motor can be provided by having a fan mounted on the pole-wheel/rotor 2, which always rotates during operation, also at a shaft standstill, which fan drives a cooling air stream through the motor.
• a motor in accordance with the invention will for example at a standstill and full torque load on the output shaft, be able to obtain complete replacement of heated air generated by electrical and mechanical loss processes.
• the motor in accordance with the invention quite well may be run in such a manner that one part motor, e.g. M1 , is run at a constant speed, while the other motor (in this case M2) is speed regulated.
• M1 one part motor
• M2 the other motor
• the shaft ⁇ m will, as always, be equal to the difference between the rpm's for each respective part motor.
• the power and the torque will be regulated in the same manner as when regulating both rpm values.
• fig. 5 is shown an embodiment of the motor in accordance with the invention indicated in closer detail, i.e. an embodiment such as shown schematically in fig. 2.
• reference numeral 1 refers to a fixed armature, wherein the coil cores may consist of electro-iron sheets or iron powder.
• the coil windings are indicated by reference numeral 14.
• the fixed armature 1 is attached to motor housing 9.
• the freely rotating pole wheel 2 (rotor) has permanent magnets.
• the rotating armature 3 has a corresponding construction as the fixed armature 1 , however is attached to a central and outward protruding shaft 5, which is supported in the motor housing via roller or ball bearings 6. Both armatures and the rotor are constructed around a common axis 4.
• Reference numeral 11 refers to brushes and slip rings for a voltage to the coil windings via brushes/commutator, i.e.
• Reference numeral 15 refers to a junction box for conductors from commutator to coil windings. It is to be noted that the rotor 2 has been given a design with a suitable extension peripherally for adaptation to the function of mediating further a voltage to the coil windings of the armatures, as well as a suitable extension centrally for obtaining stable support and rotation.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
• Dc Machiner (AREA)
• Electric Propulsion And Braking For Vehicles (AREA)
• Valve Device For Special Equipments (AREA)
• Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
• Glass Compositions (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=19898877

Family Applications (1)

Country Status (10)

Families Citing this family (12)

Family Cites Families (5)

• 1995
  • 1995-12-22 NO NO955282A patent/NO302850B1/no unknown
• 1996
  • 1996-12-20 EP EP96944138A patent/EP0888664A1/en not_active Ceased
  • 1996-12-20 PL PL96327293A patent/PL182068B1/pl unknown
  • 1996-12-20 JP JP09523533A patent/JP2000502875A/ja active Pending
  • 1996-12-20 CA CA002244965A patent/CA2244965A1/en not_active Abandoned
  • 1996-12-20 US US09/091,754 patent/US5994811A/en not_active Expired - Fee Related
  • 1996-12-20 AU AU14014/97A patent/AU704303B2/en not_active Ceased
  • 1996-12-20 CZ CZ981980A patent/CZ198098A3/cs unknown
  • 1996-12-20 KR KR1019980704812A patent/KR19990076698A/ko not_active Application Discontinuation
  • 1996-12-20 WO PCT/NO1996/000296 patent/WO1997023940A1/en not_active Application Discontinuation

Non-Patent Citations (1)

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